Sand making machine with adjustable sand grain size

Abstract

The invention discloses a sand making machine with the adjustable sand grain size, and relates to the technical field of sand making machines, the sand making machine comprises a screening treatment box, a screening assembly is installed in the screening treatment box, a secondary crushing box is installed at the upper end of the screening treatment box, and a crushing assembly is installed in the secondary crushing box; transmission assemblies are installed on the left side and the right side of the crushing assembly correspondingly, and a control mechanism is installed on the transmission assembly located on the left side. A primary crushing part is installed above the middle of the secondary crushing box, a frame body is further installed on the secondary crushing box, a feeding hopper is installed on the frame body, and an adjusting mechanism is installed on the primary crushing part. According to the sand making machine with the adjustable sand grain size, secondary crushing is conducted on materials through cooperation of the primary crushing part and the crushing assembly, the productivity is guaranteed, the grain shape and grading quality of finished sand are improved, the primary crushing grain size and the secondary crushing grain size can be adjusted at the same time, and the adjusting efficiency and coordination are improved.

Description

Technical Field

[0001] This invention relates to the field of sand making machine technology, specifically to a sand making machine with adjustable sand particle size. Background Technology

[0002] In recent years, with the continuous expansion of construction scale, the market demand for manufactured sand, as a core raw material for building materials such as concrete and asphalt, has experienced explosive growth. Depending on the different requirements of building materials, stone can be mixed with cement, lime, and water in different proportions to produce masonry mortar, precast slabs, or reinforced concrete frames.

[0003] Traditional sand making equipment, due to its simple process and low control precision, can hardly meet the needs of modern engineering for high-quality sand and gravel, and urgently needs technological innovation. For example, there is a limitation in the adjustment of sand particle size. In actual engineering applications, different construction projects have different requirements for sand particle size and gradation. However, traditional sand making machines cannot meet such diverse needs. Existing sand making machines mostly use a single crushing method or a fixed crushing gap, which makes it difficult to meet the diverse needs of different projects for sand particle size and gradation, resulting in a low qualified rate of finished sand and the need for secondary processing.

[0004] Therefore, we propose a sand making machine with adjustable sand particle size to solve the problems mentioned above. Summary of the Invention

[0005] 1. The technical problem that the invention aims to solve: The purpose of this invention is to provide a sand making machine with adjustable sand particle size to solve the problems currently found in the market as described in the background art.

[0006] 2. Technical Solution: To achieve the above objectives, the present invention provides the following technical solution: a sand making machine with adjustable sand particle size, comprising a screening box, wherein a screening component is installed inside the screening box, and a secondary crushing box is installed at the upper end of the screening box, wherein a crushing component is installed inside the secondary crushing box, and transmission components are installed on both the left and right sides of the crushing component, and a set of control mechanisms is installed on the transmission component on the left side. A primary crushing component is installed above the middle of the secondary crushing box, and a frame is also installed on the secondary crushing box. A feed hopper is installed on the frame, and an adjustment mechanism is installed on the primary crushing component.

[0007] Furthermore, the screening assembly includes a first screen plate, a second screen plate, and a collection drawer. The first screen plate and the second screen plate are installed at an angle inside the screening processing box and are arranged vertically. A vibrator is installed at the bottom of both the first screen plate and the second screen plate, and the collection drawer is installed at the bottom of the screening processing box.

[0008] The above technical solution enables the use of sieve plate one and sieve plate two to screen and classify the crushed material for collection.

[0009] Furthermore, the upper end of the secondary crushing box is provided with a feed guide port, and a baffle is installed on both the left and right sides inside the secondary crushing box. An inclined guide groove is reserved between the bottom of the baffle and the secondary crushing box, and two through slots are opened inside each baffle. An air jet blocking component is installed between the two baffles. The air jet blocking component includes two air jet pipes, and a connecting pipe is provided between the two air jet pipes. The two air jet pipes are respectively located on the upper side of the two baffles.

[0010] The above technical solution allows the material after primary crushing to enter the secondary crushing chamber from the feed guide port. Most of the impurities are intercepted by the baffle, and then a secondary barrier is formed by the air curtain formed by the jet pipe, so as to avoid affecting the normal operation of the mechanisms on the left and right sides of the central rod one and central rod two.

[0011] Furthermore, the crushing assembly includes a central rod one and a central rod two, with a set of support members installed at both the left and right ends of the central rod one and the central rod two, and a crushing roller is sleeved and fixed in the middle of the central rod one and the central rod two, and the through groove is sleeved on the outside of the central rod one or the central rod two. The support component includes a rotating rod fixedly installed on the inner wall of the secondary crushing box. The rotating rod is rotatably connected to the corresponding center rod one or center rod two via a movable shaft and has a through groove with an arc design centered on the center of the corresponding rotating rod.

[0012] The above technical solution allows the first and second central rods to rotate around the corresponding rotating rods, thereby adjusting the distance between the two crushing rollers and regulating the particle size of the secondary crushing output.

[0013] Furthermore, the transmission assembly includes a first rotating plate rotatably sleeved on the outside of the first central rod and a second rotating plate rotatably sleeved on the outside of the second central rod, the ends of the first rotating plate and the second rotating plate are rotatably connected, and a transmission component is installed between the first central rod, the second central rod and the first rotating plate; The transmission component includes two driven gears, which are respectively fixedly sleeved on the outer sides of the first central rod and the second central rod. The transmission component also includes a guide gear and a drive rod rotatably mounted on the first rotating plate. A drive gear is fixedly mounted on the drive rod. The driven gear, drive gear, guide gear on the first central rod and the driven gear on the second central rod are the same size and mesh in sequence.

[0014] The above technical solution enables the two crushing rollers to rotate in opposite directions by the meshing action after the external motor drives the drive rod to rotate, thereby crushing the material.

[0015] Furthermore, the control mechanism includes an active rod mounted in the secondary crushing chamber via bearings, a transmission belt assembly is installed between the active rod and the drive rod, and the belt of the transmission belt assembly is connected to the tension wheel assembly.

[0016] The above technical solution ensures that the active rod can stably drive the drive rod to rotate under the action of the tensioning wheel assembly.

[0017] Furthermore, the primary crushing component includes a drive seat mounted on a secondary crushing box. A moving cone liner is mounted on the upper middle part of the drive seat, and a housing is provided on the outer side of the moving cone liner. The housing is fixed on the drive seat, and a fixed cone liner is slidably mounted on the upper end of the housing. A feed pipe is attached to the inner wall of the upper end of the fixed cone liner, and the feed pipe is fixed to the lower end of the feed hopper. The adjustment mechanism includes a movable plate, which includes a first sleeve plate fixedly sleeved on the outer side of the upper end of the fixed cone liner plate. A second sleeve plate is fixed on each of the left and right sides of the first sleeve plate. The front and rear sides of the first sleeve plate are respectively fixed to the output ends of two hydraulic cylinders. The two hydraulic cylinders are symmetrically installed on the front and rear sides of the upper end of the secondary crushing box. The second sleeve plate is slidably mounted on the outer side of the frame.

[0018] The above technical solution enables the material to be crushed in one step under the action of the moving cone liner and the fixed cone liner. When the hydraulic cylinder is started, it can drive the fixed cone liner to move up and down to adjust the gap between the moving cone liner and the fixed cone liner and control the particle size of the primary crushing.

[0019] Furthermore, a steering component is provided at the bottom end of the second sleeve plate. The steering component includes two sets of tooth blocks. The two sets of tooth blocks are respectively installed on the lower side of the second sleeve plate and the upper side of the vertical plate. The vertical plate is slidably disposed inside the secondary crushing box. The two sets of tooth blocks mesh with the two sides of the gear roller. The gear roller is installed at the upper end of the secondary crushing box through bearings.

[0020] The above technical solution enables the vertical plate to move upward when the second sleeve moves downward, and conversely, the vertical plate to move downward when the second sleeve moves upward.

[0021] Furthermore, a vertical displacement component is provided at the bottom end of the vertical plate. The vertical displacement component includes a sliding frame fixedly connected to the bottom end of the vertical plate. Two sliders are slidably arranged inside the sliding frame, and the two sliders are respectively rotatably sleeved on the outside of the central rod one and the central rod two. Limiting plates are attached to the front and rear sides of the sliding frame, and the limiting plates are fixed to the inner wall of the secondary crushing box.

[0022] The above technical solution enables the sliding frame to move up and down between the two limiting plates during the vertical movement of the vertical plate. Since the slider is rotated and sleeved on the outside of the central rod one or the central rod two, it slides laterally inside the sliding frame as the sliding frame moves up and down.

[0023] 3. Beneficial effects: Compared with the prior art, the sand making machine with adjustable sand particle size of the present invention performs secondary crushing of materials through the cooperation of primary crushing parts and crushing components, ensuring production capacity and improving the particle shape and gradation quality of the finished sand. Furthermore, it can simultaneously adjust the primary and secondary crushing particle sizes, improving adjustment efficiency and coordination. The specific details are as follows: First, the material enters the primary crusher from the feed hopper through the feed pipe. It undergoes primary crushing through the fixed cone liner and the moving cone liner. The material after primary crushing falls into the secondary crushing box through the feed guide port, where it is crushed by the rotation and extrusion of two crushing rollers. Through the combination of "coarse crushing and shaping + medium crushing and finishing", the particle shape and gradation quality of the finished sand are significantly improved while ensuring production capacity. Then, the crushed material enters the screening and processing box, where it is screened by the vibration of screen plate one and screen plate two to classify and collect sand particles of different sizes, thus completing the sand making process. When it is necessary to adjust the size of the crushed sand particles, start the hydraulic cylinder. The hydraulic cylinder drives the sleeve plate to move up and down, which in turn drives the fixed cone liner to rise and fall, changing the gap between it and the moving cone liner, and controlling the output particle size of the primary crushing (the smaller the gap, the finer the output). When the first sleeve plate moves up and down, the vertical plate moves up and down in the opposite direction through the steering component, which in turn causes the sliding frame to move between the two limit plates. Since the slider is slidably set inside the sliding frame, when the fixed cone liner moves down, the gap between the fixed cone liner and the moving cone liner is reduced. The vertical plate causes the sliding frame to move up. The first and second center rods move up and move closer to each other under the action of the support component (the smaller the gap, the finer the output). This allows the primary and secondary crushing to be adjusted synchronously without independent operation, improving adjustment efficiency and coordination. When the motor connected to the end of the drive rod starts, the drive rod drives the drive rod to rotate synchronously through the transmission belt assembly. The tension wheel assembly automatically adjusts the transmission belt tension to ensure stable transmission. The drive rod drives the drive gear to rotate synchronously. The driven gear, drive gear, guide gear on center rod one and the driven gear on center rod two are of the same size and mesh sequentially, driving the driven gear on center rod one and the driven gear on center rod two to rotate synchronously in opposite directions. This drives the crushing rollers on center rod one and center rod two to rotate, thus stably crushing the material. During the operation of the crushing roller, the baffles on the left and right sides of the secondary crushing box become the first physical barrier, which can effectively intercept most of the splashed crushing particles and prevent them from spreading to the key parts of the equipment. At the same time, after the air supply equipment connected to the end of the connecting pipe is started, high-pressure gas will be ejected at high speed through the jet pipe to form an air curtain, further blocking particle impurities and avoiding affecting the normal operation of the left and right sides of the central rod one and central rod two. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the secondary crushing box of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the crushing roller structure of the present invention; Figure 5 This is a side view of the vertical displacement component of the present invention. Figure 6 This is a schematic diagram of the transmission component structure of the present invention; Figure 7 This is a schematic diagram of the internal structure of the outer shell of the present invention.

[0025] In the diagram: 1. Screening box; 2. Screening assembly; 21. Screen plate one; 22. Screen plate two; 23. Collection drawer; 3. Secondary crushing box; 31. Feed guide port; 4. Baffle; 41. Through groove; 5. Air jet barrier; 51. Connecting pipe; 52. Air jet pipe; 6. Crushing assembly; 61. Center rod one; 62. Center rod two; 63. Support component; 631. Rotating rod; 632. Connecting plate; 64. Crushing roller; 7. Transmission assembly; 71. First rotating plate; 72. Second rotating plate; 73. Transmission component; 731. Driven gear; 732. Guide gear; 733. Drive. 734. Drive gear; 8. Control mechanism; 81. Active rod; 82. Transmission belt assembly; 83. Tensioner assembly; 9. Vertical displacement component; 91. Slider; 92. Sliding frame; 93. Limiting plate; 10. Vertical plate; 11. Primary crushing component; 111. Drive seat; 112. Outer shell; 113. Moving cone liner; 114. Fixed cone liner; 12. Frame; 13. Feed hopper; 131. Feed pipe; 14. Movable plate; 141. Sleeve plate one; 142. Sleeve plate two; 15. Hydraulic cylinder; 16. Steering component; 161. Gear roller; 162. Gear block assembly. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example: Please see Figure 1-7This invention provides a technical solution: a sand making machine with adjustable sand particle size, including a screening box 1, a screening component 2 installed inside the screening box 1, and a secondary crushing box 3 installed at the upper end of the screening box 1. A crushing component 6 is installed inside the secondary crushing box 3, and transmission components 7 are installed on both the left and right sides of the crushing component 6. A control mechanism 8 is installed on the transmission component 7 on the left side. A primary crushing component 11 is installed above the middle of the secondary crushing box 3, and a frame 12 is also installed on the secondary crushing box 3. A feed hopper 13 is installed on the frame 12, and an adjustment mechanism is installed on the primary crushing component 11. The screening component 2 includes a first screen plate 21, a second screen plate 22, and a collection tray 23. The first screen plate 21 and the second screen plate 22... The second plate 22 is installed at an incline inside the screening box 1, and the first screen plate 21 and the second screen plate 22 are distributed vertically. Vibrators are installed at the bottom of both the first screen plate 21 and the second screen plate 22. The collection drawer 23 is installed at the bottom of the screening box 1. The primary crushing component 11 includes a drive seat 111 installed on the secondary crushing box 3. A moving cone liner 113 is installed at the upper middle part of the drive seat 111. A housing 112 is provided on the outer side of the moving cone liner 113. The housing 112 is fixed on the drive seat 111. A fixed cone liner 114 is slidably installed on the upper end of the housing 112. A feed pipe 131 is attached to the inner wall of the upper end of the fixed cone liner 114. The feed pipe 131 is fixed to the lower end of the feed hopper 13. First, the material enters the primary crusher 11 from the feed hopper 13 through the feed pipe 131. The drive seat 111 drives the moving cone liner 113 to rotate using the existing cone crusher working principle, so it will not be described in detail. The moving cone liner 113 performs primary crushing of the material through cooperation with the fixed cone liner 114. The material after primary crushing falls into the secondary crushing box 3 through the feed guide port 31, and is subjected to secondary crushing by the rotation and extrusion of two crushing rollers 64. Through the combination of "coarse crushing and shaping + medium crushing and finishing", the particle shape and gradation quality of the finished sand are significantly improved while ensuring the production capacity. Subsequently, the crushed material enters the screening and processing box 1, and is screened by the vibration of screen plate 1 21 and screen plate 22 to classify and collect sand particles of different sizes, thus completing the sand making process. The upper end of the secondary crushing box 3 is provided with a feed guide port 31, and a baffle 4 is installed on both the left and right sides inside the secondary crushing box 3. An inclined guide groove is reserved between the bottom of the baffle 4 and the secondary crushing box 3. Each baffle 4 has two through slots 41 inside. An air jet blocking component 5 is installed between the two baffles 4. The air jet blocking component 5 includes two air jet pipes 52. A connecting pipe 51 is provided between the two air jet pipes 52. The two air jet pipes 52 are respectively located on the upper side of the two baffles 4. During the operation of the crushing roller 64, the baffles 4 on the left and right sides of the secondary crushing box 3 form the first physical barrier, which intercepts most of the splashed crushing particles and prevents them from spreading to the key parts of the equipment. At the same time, after the air supply equipment connected to the end of the connecting pipe 51 is started, the high-pressure gas will be ejected at high speed through the jet pipe 52 to form an air curtain, further blocking the particle impurities and avoiding affecting the normal operation of the left and right sides of the central rod 61 and the central rod 62. The crushing assembly 6 includes a central rod 61 and a central rod 62. A set of support members 63 is installed at both ends of the central rods 61 and 62, and a crushing roller 64 is fixedly fitted onto the middle of each central rod 61 and 62. A through groove 41 is fitted onto the outside of the central rod 61 or 62. The support member 63 includes a rotating rod 631 fixedly installed on the inner wall of the secondary crushing box 3. The rotating rod 631 is rotatably connected to the corresponding central rod 61 or 62 via a movable shaft, and the through groove 41 has an arc-shaped design with the center of the corresponding rotating rod 631 as the center. The transmission assembly 7 includes a first rotating plate 71 rotatably fitted onto the outside of the central rod 61 and a second rotating plate 72 rotatably fitted onto the outside of the central rod 62. The ends of the first rotating plate 71 and the second rotating plate 72 are rotatably connected. A transmission component 73 is installed between the first central rod 61, the second central rod 62, and the first rotating plate 71. The transmission component 73 includes two driven gears 731, which are respectively fixedly sleeved on the outside of the first central rod 61 and the second central rod 62. The transmission component 73 also includes a guide gear 732 and a drive rod 733 rotatably mounted on the first rotating plate 71. A drive gear 734 is fixedly mounted on the drive rod 733. The driven gears 731, drive gear 734, guide gear 732 on the first central rod 61 and the driven gears 731 on the second central rod 62 are the same size and mesh sequentially. The control mechanism 8 includes an active rod 81 installed in the secondary crushing box 3 through bearings. A transmission belt assembly 82 is installed between the active rod 81 and the drive rod 733, and the belt of the transmission belt assembly 82 is connected to the tensioning pulley assembly 83. When the external motor drives the drive rod 81 to rotate, the drive rod 81 drives the drive rod 733 to rotate synchronously through the transmission belt assembly 82. The tension wheel assembly 83 automatically adjusts the transmission belt tension to ensure stable transmission. After the drive rod 733 rotates, it drives the drive gear 734 fixed at the end to rotate synchronously. Then, the driven gear 731, drive gear 734, guide gear 732 on the first central rod 61 and the driven gear 731 on the second central rod 62 are of the same size and mesh in sequence, driving the driven gear 731 on the first central rod 61 and the driven gear 731 on the second central rod 62 to rotate synchronously in opposite directions. This drives the crushing roller 64 on the first central rod 61 and the second central rod 62 to rotate, thus stably crushing the material. The adjustment mechanism includes a movable plate 14, which includes a first sleeve 141 fixedly sleeved on the outer side of the upper end of the fixed cone liner 114. A second sleeve 142 is fixed to each of the left and right sides of the first sleeve 141. The front and rear sides of the first sleeve 141 are respectively fixed to the output ends of two hydraulic cylinders 15, which are symmetrically installed on the front and rear sides of the upper end of the secondary crushing box 3. The second sleeve 142 is slidably mounted on the outer side of the frame 12. A steering component 16 is provided at the bottom end of the second sleeve 142. The steering component 16 includes two sets of toothed blocks 162, which are respectively installed on the lower side of the second sleeve 142. The upper side of the vertical plate 10 is slidably disposed inside the secondary crushing box 3. Two sets of toothed blocks 162 mesh with the two sides of the gear roller 161 respectively, and the gear roller 161 is installed on the upper end of the secondary crushing box 3 through bearings. A vertical displacement member 9 is provided at the bottom end of the vertical plate 10. The vertical displacement member 9 includes a sliding frame 92 fixedly connected to the bottom end of the vertical plate 10. Two sliders 91 are slidably disposed in the sliding frame 92, and the two sliders 91 are rotatably sleeved on the outside of the center rod 1 61 and the center rod 2 62 respectively. Limiting plates 93 are attached to the front and rear sides of the sliding frame 92, and the limiting plates 93 are fixed to the inner wall of the secondary crushing box 3. Hydraulic cylinder 15 is activated, driving sleeve 141 to move up and down, which in turn raises and lowers the fixed cone liner 114, changing its gap with the moving cone liner 113. This controls the particle size distribution of the primary crushing output; the smaller the gap, the finer the output. When hydraulic cylinder 15 moves the fixed cone liner 114 downward, it reduces the gap between the fixed cone liner 114 and the moving cone liner 113. At this time, sleeve 142, using the meshing action between the two sets of toothed blocks 162 and the gear roller 161, drives the vertical plate 10 upward, which in turn drives the sliding frame 92 upward. During the upward movement, the contact action between the sliding frame 92 and the slider 91 drives the central rod 161 and the central rod 262 to support... The rotating rod 631 of the support member 63 swings around the axis, shortening the distance between the crushing roller 64 on the first central rod 61 and the crushing roller 64 on the second central rod 62. Conversely, when the hydraulic cylinder 15 drives the fixed cone liner 114 to move upward, the distance between the crushing roller 64 on the first central rod 61 and the crushing roller 64 on the second central rod 62 can be widened to adapt to the crushing particle size requirements. During this process, the transmission assembly 7 composed of the first rotating plate 71 and the second rotating plate 72 is flexibly rotated and can adaptively adjust the angle to ensure that the drive gear 734, the guide gear 732 and the driven gear 731 always maintain effective meshing, ensuring the normal operation of the crushing roller 64.

[0028] Working principle: When using this sand making machine with adjustable sand size, such as Figure 1-7As shown, the material first enters the primary crusher 11 from the feed hopper 13 through the feed pipe 131. The material is initially crushed by the cooperation of the moving cone liner 113 and the fixed cone liner 114. The material after primary crushing falls into the secondary crushing box 3 through the feed guide port 31, where it is further crushed by the rotation and extrusion of two crushing rollers 64. When it is necessary to adjust the crushed output particle size, the hydraulic cylinder 15 is activated to drive the fixed cone liner 114 to move up and down, adjusting the gap between the fixed cone liner 114 and the moving cone liner 113. During the up and down movement of the fixed cone liner 114, the distance between the two crushing rollers 64 can be adjusted synchronously using the steering component 16, the vertical displacement component 9, and the transmission component 7 to adapt to the actual particle size requirements. Subsequently, the crushed sand and gravel enter the screening and processing box 1, where different particle sizes are classified and collected by the vibration screening of the first screen plate 21 and the second screen plate 22, completing the sand making process.

[0029] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sand making machine with adjustable sand particle size, characterized in that: Includes a screening box (1), inside which a screening component (2) is installed, and at the upper end of the screening box (1) a secondary crushing box (3) is installed, inside which a crushing component (6) is installed, and on both the left and right sides of the crushing component (6) a transmission component (7) is installed, and on the transmission component (7) on the left side a set of control mechanisms (8) is installed. A primary crushing component (11) is installed above the middle part of the secondary crushing box (3), and a frame (12) is also installed on the secondary crushing box (3). A feed hopper (13) is installed on the frame (12), and an adjustment mechanism is installed on the primary crushing component (11).

2. The sand making machine with adjustable sand particle size according to claim 1, characterized in that: The screening assembly (2) includes a first screen plate (21), a second screen plate (22), and a collection drawer (23). The first screen plate (21) and the second screen plate (22) are installed in an inclined manner inside the screening processing box (1), and the first screen plate (21) and the second screen plate (22) are distributed vertically. The bottom of the first screen plate (21) and the second screen plate (22) are both equipped with vibrators, and the collection drawer (23) is installed at the bottom of the screening processing box (1).

3. The sand making machine with adjustable sand particle size according to claim 1, characterized in that: The upper end of the secondary crushing box (3) is provided with a feed guide port (31), and a baffle (4) is installed on both the left and right sides inside the secondary crushing box (3). An inclined guide groove is reserved between the bottom of the baffle (4) and the secondary crushing box (3), and two through slots (41) are opened inside each baffle (4). An air jet barrier (5) is installed between the two baffles (4). The air jet barrier (5) includes two air jet pipes (52). A connecting pipe (51) is provided between the two air jet pipes (52), and the two air jet pipes (52) are respectively located on the upper side of the two baffles (4).

4. A sand making machine with adjustable sand particle size according to claim 3, characterized in that: The crushing assembly (6) includes a central rod one (61) and a central rod two (62). A set of support members (63) are installed at both the left and right ends of the central rod one (61) and the central rod two (62). A crushing roller (64) is sleeved and fixed in the middle of the central rod one (61) and the central rod two (62). The through groove (41) is sleeved on the outside of the central rod one (61) or the central rod two (62). The support member (63) includes a rotating rod (631) fixedly installed on the inner wall of the secondary crushing box (3). The rotating rod (631) is rotatably connected to the corresponding center rod one (61) or center rod two (62) via a movable shaft. The through groove (41) is an arc-shaped design with the center of the corresponding rotating rod (631) as the center.

5. A sand making machine with adjustable sand particle size according to claim 4, characterized in that: The transmission assembly (7) includes a first rotating plate (71) rotatably sleeved on the outside of the first central rod (61) and a second rotating plate (72) rotatably sleeved on the outside of the second central rod (62). The ends of the first rotating plate (71) and the second rotating plate (72) are rotatably connected. A transmission component (73) is installed between the first central rod (61), the second central rod (62) and the first rotating plate (71). The transmission component (73) includes two driven gears (731), which are fixedly sleeved on the outer sides of the first central rod (61) and the second central rod (62). The transmission component (73) also includes a guide gear (732) and a drive rod (733) rotatably mounted on the first rotating plate (71). A drive gear (734) is fixedly mounted on the drive rod (733). The driven gears (731), drive gears (734), guide gears (732) on the first central rod (61) and the driven gears (731) on the second central rod (62) are the same size and mesh in sequence.

6. A sand making machine with adjustable sand particle size according to claim 5, characterized in that: The control mechanism (8) includes an active rod (81) mounted in the secondary crushing box (3) via a bearing. A transmission belt assembly (82) is installed between the active rod (81) and the drive rod (733), and the belt of the transmission belt assembly (82) is connected to the tension wheel assembly (83).

7. A sand making machine with adjustable sand particle size according to claim 1, characterized in that: The primary crushing component (11) includes a drive seat (111) installed on the secondary crushing box (3). A moving cone liner (113) is installed at the upper middle part of the drive seat (111), and a shell (112) is provided on the outer side of the moving cone liner (113). The shell (112) is fixed on the drive seat (111), and a fixed cone liner (114) is slidably installed on the upper end of the shell (112). A feed pipe (131) is attached to the inner wall of the upper end of the fixed cone liner (114), and the feed pipe (131) is fixed to the lower end of the feed hopper (13). The adjustment mechanism includes a movable plate (14), which includes a sleeve plate (141) fixedly sleeved on the outer side of the upper end of the fixed cone liner (114). A sleeve plate (142) is fixed on the left and right sides of the sleeve plate (141). The front and rear sides of the sleeve plate (141) are respectively fixed to the output ends of two hydraulic cylinders (15). The two hydraulic cylinders (15) are symmetrically installed on the front and rear sides of the upper end of the secondary crushing box (3). The sleeve plate (142) is slidably mounted on the outer side of the frame (12).

8. A sand making machine with adjustable sand particle size according to claim 7, characterized in that: The bottom end of the second sleeve plate (142) is provided with a steering component (16), which includes two sets of tooth block groups (162). The two sets of tooth block groups (162) are respectively installed on the lower side of the second sleeve plate (142) and the upper side of the vertical plate (10). The vertical plate (10) is slidably disposed inside the secondary crushing box (3). The two sets of tooth block groups (162) mesh with the two sides of the gear roller (161), and the gear roller (161) is installed on the upper end of the secondary crushing box (3) through bearings.

9. A sand making machine with adjustable sand particle size according to claim 8, characterized in that: The bottom end of the vertical plate (10) is provided with a vertical displacement component (9). The vertical displacement component (9) includes a sliding frame (92) fixedly connected to the bottom end of the vertical plate (10). The sliding frame (92) has two sliders (91) that are slidably attached to each other in the front and back. The two sliders (91) are respectively rotatably sleeved on the outside of the first central rod (61) and the second central rod (62). The front and back sides of the sliding frame (92) are attached with limiting plates (93). The limiting plates (93) are fixed to the inner wall of the secondary crushing box (3).

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